vt8225 ETC-unknow, vt8225 Datasheet

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vt8225

Manufacturer Part Number
vt8225
Description
Clock Generator
Manufacturer
ETC-unknow
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
vt8225N
Manufacturer:
V/A
Quantity:
20 000
1045 Mission Court.
Fremont, CA 94539
USA
TEL: 1-510-683-3300 FAX: 1-510-683-3301
Features
Description
The VT8225 is a universal clock generator for motherboard design. The product at a glimpse:
1. Generates all kinds of required clocks for CPU and bus operation from 6 Mhz to 80 Mhz.
2. Eliminates at least two oscillators, which are oscillators for CPU and 14.318MHz oscillator.
3. Simplifies inventory: VT8225 covers required main clock for the motherboard design.
4. Provides a reliable clock for the PLL design.
5. Is pin-to-pin compatible to oscillator.
VIA Technologies, Inc
Generates essential clock signals for the motherboard
4V to 7V operating supply range
Supports 80286, 80386 and 80486 based designs
Wide range of selectable output frequencies
< 2ns skew between CPU and 2X CPU clock outputs
Single low cost crystal (14.318Mhz) used as reference frequency
Smooth transition on frequency switching
50% duty cycle
Power down mode for low power consumption
TTL or CMOS compatible outputs with 12mA drive capability
Low, short and long term jitter
14 pin DIP and 14 pin SOIC (300 mil body) package options
VT8225 Clock Generator
.
-1-
TEL: 886-2-218-5452 FAX: 886-2-218-5453
Chung-cheng Rd.,Hsin-tien
Taipei, Taiwan, R.O.C.
8th. Fl., No. 533
Date: July 5, 1994
VT8225

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vt8225 Summary of contents

Page 1

... DIP and 14 pin SOIC (300 mil body) package options Description The VT8225 is a universal clock generator for motherboard design. The product at a glimpse: 1. Generates all kinds of required clocks for CPU and bus operation from 6 Mhz to 80 Mhz. 2. Eliminates at least two oscillators, which are oscillators for CPU and 14.318MHz oscillator. ...

Page 2

... VIA Technologies, Inc. VT8225 Signal Description Symbol Pin No. Type These pins form an on-chip reference oscillator when connected to terminals of an external parallel resonant crystal (norminally X2 3 I/O 14.318Mhz). X1 may also serve as input for an externally generated reference signal Frequency select inputs. These inputs control the MCLK frequency ...

Page 3

... Vout) < Symbol Min Typ 2 2 VDD = -40 -3- VT8225 Max Units 0.8 Vdc - Vdc 0.4 Vdc - Vdc + 50pF ...

Page 4

... Input Rise and Fall Times OSCIN Symbol Min Typ TLH THL 48/ +0.5 J1S t +3 ABS TLH THL o VDD = +85 -4- VT8225 Max Units 50pF ...

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